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Message-ID: <0f572801-8dcb-4124-94fa-cb219f60730d@amd.com>
Date: Tue, 5 Mar 2024 12:38:25 -0500
From: Felix Kuehling <felix.kuehling@....com>
To: "Ricardo B. Marliere" <ricardo@...liere.net>,
Alex Deucher <alexander.deucher@....com>,
Christian König <christian.koenig@....com>,
David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>
Cc: amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org, Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] drm/amdkfd: make kfd_class constant
On 2024-03-05 7:15, Ricardo B. Marliere wrote:
> Since commit 43a7206b0963 ("driver core: class: make class_register() take
> a const *"), the driver core allows for struct class to be in read-only
> memory, so move the kfd_class structure to be declared at build time
> placing it into read-only memory, instead of having to be dynamically
> allocated at boot time.
>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Suggested-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Signed-off-by: Ricardo B. Marliere <ricardo@...liere.net>
The patch looks good to me. Do you want me to apply this to Alex's
amd-staging-drm-next?
Reviewed-by: Felix Kuehling <felix.kuehling@....com>
> ---
> drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 21 +++++++++++----------
> 1 file changed, 11 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> index f030cafc5a0a..dfa8c69532d4 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> @@ -63,8 +63,10 @@ static const struct file_operations kfd_fops = {
> };
>
> static int kfd_char_dev_major = -1;
> -static struct class *kfd_class;
> struct device *kfd_device;
> +static const struct class kfd_class = {
> + .name = kfd_dev_name,
> +};
>
> static inline struct kfd_process_device *kfd_lock_pdd_by_id(struct kfd_process *p, __u32 gpu_id)
> {
> @@ -94,14 +96,13 @@ int kfd_chardev_init(void)
> if (err < 0)
> goto err_register_chrdev;
>
> - kfd_class = class_create(kfd_dev_name);
> - err = PTR_ERR(kfd_class);
> - if (IS_ERR(kfd_class))
> + err = class_register(&kfd_class);
> + if (err)
> goto err_class_create;
>
> - kfd_device = device_create(kfd_class, NULL,
> - MKDEV(kfd_char_dev_major, 0),
> - NULL, kfd_dev_name);
> + kfd_device = device_create(&kfd_class, NULL,
> + MKDEV(kfd_char_dev_major, 0),
> + NULL, kfd_dev_name);
> err = PTR_ERR(kfd_device);
> if (IS_ERR(kfd_device))
> goto err_device_create;
> @@ -109,7 +110,7 @@ int kfd_chardev_init(void)
> return 0;
>
> err_device_create:
> - class_destroy(kfd_class);
> + class_unregister(&kfd_class);
> err_class_create:
> unregister_chrdev(kfd_char_dev_major, kfd_dev_name);
> err_register_chrdev:
> @@ -118,8 +119,8 @@ int kfd_chardev_init(void)
>
> void kfd_chardev_exit(void)
> {
> - device_destroy(kfd_class, MKDEV(kfd_char_dev_major, 0));
> - class_destroy(kfd_class);
> + device_destroy(&kfd_class, MKDEV(kfd_char_dev_major, 0));
> + class_unregister(&kfd_class);
> unregister_chrdev(kfd_char_dev_major, kfd_dev_name);
> kfd_device = NULL;
> }
>
> ---
> base-commit: 8bc75586ea01f1c645063d3472c115ecab03e76c
> change-id: 20240305-class_cleanup-drm-amd-bdc7255b7540
>
> Best regards,
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